The economy of South Africa is a mixed economy, emerging market, and upper-middle-income economy, one of only eight such countries in Africa. The economy is the most industrialized, technologically advanced, and diversified economy in Africa. Following 1996, at the end of over twelve years of international sanctions, South Africa's nominal gross domestic product (GDP) almost tripled to a peak of US$416 billion in 2011. In the same period, foreign exchange reserves increased from US$3 billion to nearly US$50 billion, creating a diversified economy with a growing and sizable middle class, within two decades of ending apartheid.

Mining in South Africa was once the main driving force behind the history and development of Africa's most advanced and richest economy. Large-scale and profitable mining started with the discovery of a diamond on the banks of the Orange River in 1867 by Erasmus Jacobs and the subsequent discovery of the Kimberley pipes a few years later. Gold rushes to Pilgrim's Rest and Barberton were precursors to the biggest discovery of all, the Main Reef/Main Reef Leader on Gerhardus Oosthuizen's farm Langlaagte, Portion C, in 1886, the Witwatersrand Gold Rush and the subsequent rapid development of the gold field there, the biggest of them all.